Dynamic aspects of metal speciation by competitive ligand exchange–adsorptive stripping voltammetry (CLE–AdSV)

Leeuwen, Herman P. van; Jansen, Stefan

doi:10.1016/j.jelechem.2005.03.006

Cited by 26 publications

(33 citation statements)

References 25 publications

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“…In CLE, bulk equilibrium must need to be established. When chemical equilibrium with L ad is not attained, the calculated stability constants overestimate the real values [10].…”

Section: Comparison Of Dgt and Clementioning

confidence: 76%

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Copper and nickel speciation in mine effluents by combination of two independent techniques

Chakraborty

Zhao

Chakrabarti

2009

Analytica Chimica Acta

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“…In CLE, bulk equilibrium must need to be established. When chemical equilibrium with L ad is not attained, the calculated stability constants overestimate the real values [10].…”

Section: Comparison Of Dgt and Clementioning

confidence: 76%

“…10 3 -10 4 s [2]. CLE/AdSV, which is a bulk equilibrium technique [10], needs ∼10 4 s to attain the chemical equilibrium in the bulk solution depending on the characteristics of the complexing ligand.…”

Section: Comparison Of Dgt and Clementioning

confidence: 99%

Copper and nickel speciation in mine effluents by combination of two independent techniques

Chakraborty

Zhao

Chakrabarti

2009

Analytica Chimica Acta

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“…109 In this case underestimated K ML values will be found. Concluding, metal speciation from CLE-AdCSV is valid if kinetics features are properly taken into account (e.g., waiting long enough).…”

Section: Stripping Chronopotentiometry (Scp)mentioning

confidence: 92%

Electrochemical Methods for Speciation of Trace Elements in Marine Waters. Dynamic Aspects

2012

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The contribution of electrochemical methods to the knowledge of dynamic speciation of toxic trace elements in marine waters is critically reviewed. Due to the importance of dynamic considerations in the interpretation of the electrochemical signal, the principles and recent developments of kinetic features in the interconversion of metal complex species will be presented. As dynamic electrochemical methods, only stripping techniques (anodic stripping voltammetry and stripping chronopotentiometry) will be used because they are the most important for the determination of trace elements. Competitive ligand exchange-adsorptive cathodic stripping voltammetry, which should be considered an equilibrium technique rather than a dynamic method, will be also discussed because the complexing parameters may be affected by some kinetic limitations if equilibrium before analysis is not attained and/or the flux of the adsorbed complex is influenced by the lability of the natural complexes in the water sample. For a correct data interpretation and system characterization the comparison of results obtained from different techniques seems essential in the articulation of a serious discussion of their meaning.

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“…The most efficient remains the ion-selective electrode for the determination of free metal activities [12][13][14][15][16][17][18][19] and a variety of voltammetric methods that can measure pools of metals of variable lability. [20][21][22][23][24] All these methods give information on the most available fraction of the trace metals, assumed to be the sum of the free ion, the inorganic complexes and the weak organic complexes. The inert pool can be obtained by difference between total and labile concentrations.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of affinity constants of Cu, Cd, Ca and H for active soil surfaces for a solid phase-controlled soil ligand model

Rachou

Sauvé

2008

Environ. Chem.

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Environmental context. The speciation of metals in soils is controlled by the equilibrium between the solid and aqueous phases and by several parameters such as pH and total metal concentrations. The integration of affinity constants between several cations and active soil surfaces of different soils in the chemical equilibrium modelling software MINEQL+ allows a good evaluation of the chemical speciation of the metals. Abstract.A new approach, derived from the concept of the biotic ligand model, was used for the determination of the affinity constants of Ca, Cu, Cd and H to the active surfaces of different kinds of soils. This approach allowed us to obtain consistent data and to integrate these values in the chemical equilibrium modelling software MINEQL+ and eventually into a solid phase-controlled soil ligand model. This could then very easily be transformed into a terrestrial biotic ligand model by adding constants for biological components. We obtained the chemical speciation of the metals of interest by integrating the initial characteristics of the soil (pH; cation exchange capacity, CEC; total metal concentrations in soil extracts; ionic strength; and CO 2 pressure). Comparison of the predicted and measured values of free Cu 2+ is excellent using soil-specific affinity constants as well as average values. The average affinity constants between the active soil surfaces (S) and the target cations are log K Ca-S = −0.84 (±0.01), log K Cu-S = 5.3 (±0.1), log K Cd-S = 4.4 (±0.2) and log K H-S = 4.1 (±0.2). External soils have been used to validate the conceptual model and the results show a very good correlation between the predicted and the measured free Cu (pCu) except for an acidic soil (pH < 5.2), highlighting the importance of integrating Al into the model.

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Dynamic aspects of metal speciation by competitive ligand exchange–adsorptive stripping voltammetry (CLE–AdSV)

Cited by 26 publications

References 25 publications

Copper and nickel speciation in mine effluents by combination of two independent techniques

Copper and nickel speciation in mine effluents by combination of two independent techniques

Electrochemical Methods for Speciation of Trace Elements in Marine Waters. Dynamic Aspects

Evaluation of affinity constants of Cu, Cd, Ca and H for active soil surfaces for a solid phase-controlled soil ligand model

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